Wosteney



Filed' Dec. 1, 1952 United States Patent O ce 2,735,890 y START-STOPTELEPREJ'IER RECEIVER Herbert Wsteney, Municll-Thalkirchen, Germany,assignor to Siemens & Halske, Aktiengesellschaft, Munich, Germany, acorporation of Germany Application December 1, 1952, Serial No. 323,487

Claims priority, application Germany December 21, 1951 9 Claims. (Cl.178-33) This invention relates to receiver mechanisms for remotelycontrolled signalling apparatus, and is particularly concerned with ateleprinter receiver operating in accordance with the start-stopprinciple.

The operative release of remotely controlled apparatus, operating inaccordance with the start-stop principle, especially of teleprinters,remotely controlled measuring devices and the like, is usually effectedby the deenergization of the receiver magnet. The release of thearmature of such magnet controls, among other operations, the start ofrotation of the motor-driven startstop or selector shaft.

The pressure of the clutch means, the friction between the variouselements due, for example, to un avoidable contamination, smalladjustment errors and the like as well as wear of the various partsconstitute unavoidable variable factors which are ascertained withdifiiculty and adversely affect the reliability of operation becausedeviations in the individual operations by tenth of milliseconds may instart-stop systems play an important part.

lt is believed that these factors cause variable loading of the armatureof the receiver magnet, thereby detrimentally atl'ecting the operationof the apparatus.

The invention proposes to eliminate the drawbacks inherent in the aboveindicated situation by relieving the armature in its normal position andalso incident to the major portion of -its release motion of extraneousloads so that it can act with a great momentum upon the operatingelements controlled by it. The armature of the receiver magnet is, inaccordance with the invention, completely free of any load. The receivercam is locked by a lever system. The pressure exerted by the clutch is,in accordance with the invention, absorbed by a special locking lever,and not by the armature.

The invention will now be described with reference to the accompanyingdrawing, showing as an example in schematic representation an embodimentin which all parts are illustrated in normal or resting position.

The receiver magnet 1, which is energized by the incoming signals, holdsin normally attracted position the armature 2, which is pivotallymounted at 3. The attractive force of the magnet 1 is opposed by aspring 15 which exerts a force in the direction P1, thus tending to movethe armature into its released position. The receiver cam 16 on theshaft 6 is acted upon by a driving force (for example, a slip clutch,not shown) which is effective in the direction of the arrow. Therotation of the receiver cam 16 having the lobe 7 is in resting positionprevented by interlocking engagement of the lobe 7 with an extensionprojecting from the locking lever 17, pivoted at 4, which is in turn inlocking engagement with the trigger lever 5. Between the finger 11 ofthe trigger lever and the extension 12 of the armature 2 is a freespace, as shown. The distance represented by this space corresponds tothe major portion of the release travel of the armature 2 responsive todeenergization of the magnet 1.

2,735,890 Patented Feb. 21, 1956 When the receiver magnet 1 isdeenergized, the armature 2 will move by the action of the spring 15pulling in the direction P1 entirely unimpeded by any variable factorfor a distance corresponding to the space between the parts 11 and 12.The larger part of the interval allotted to the release travel of thearmature therefore is constant. The extension 12 of the armature 2 hitsthe finger l1 of the trigger lever 5 with great momentum stored in itsunimpeded motion, and the lever 5 moves away from the stop 10 againstthe force of a spring 18 acting in the direction P2 and frees thelocking lever 17. The action is positive and forceful. The receiver cam16 can now rotate in the direction of the arrow.

The locking lever 17 is restored to its initial position by the force ofa spring 19 acting in the direction P4 as soon as the lobe 7 of thereceiver cam 16 has Sulliciently rotated to the right.

The lobe 8 on the receiver cam means hits the angular end 20 of thelower arm 9 of the restoring lever near the termination of itsrevolution, causing counterclockwise displacement of the lever arm 9against the force of a spring 21 which acts in the direction P3. To thelower arm 9 of the restoring lever is connected an other arm 9', by aconnecting link 23. Accordingly, the angular end 22 of the arm 9 of therestoring lever hits the extension 12 of the armature 2, thus causingthe armature to move positively into its normal position against theforce of the spring 15 until it is in engage ment with the pole shoes ofthe magnet 1. The trigger lever 5 is thereby freed and placed inengagement with the stop 10 by the action of the spring 18 pulling inthe direction P2. The locking lever 17 pivoted at 4 interlocks againwith the trigger lever 5, thereby arresting the motion of the receivercam means on the shaft 6 by interlocking engagement of its lobe 7. Thereceiver cam means remains now at rest so long as the armature 2 of themagnet 1 is in attracted position.

The described interplay and interaction of the parts is again initiatedresponsive to the deenergization of the magnet 1.

Changes may be made within the scope and spirit of the appended claims.

I claim:

l. A start-stop signalling apparatus comprising cam means and meansattempting to rotate it, a trigger lever and means for pivotallymounting it at a point between the opposite ends thereof, means actingupon one end of said trigger lever to hold the other end thereof in apredetermined position, interlock means between said trigger lever andsaid cam means to hold said cam means against rotation by the meansattempting to rotate it, a receiver magnet having a normally attractedpivoted armature, force means acting upon said armature attempting tomove it into its released position, and an operating arm extending fromsaid armature for coaction with said other end of said trigger lever,said operating arm being in attracted position of said armature spacedfrom such other end of said trigger lever by a predetermined distancecorresponding to the major portion of angular travel of said operatingarm incident to the release of said armature responsive todeenergization of said receiver magnet, whereby said armature moves intoreleased position by the action of said force means wholly unimpeded byany external force to move said operating arm wholly unimpeded by anangular amount corresponding to said predetermined distance so as tostrike said other end of said trigger lever with the momentum stored inits unimpeded travel for the purpose of displacing said trigger leverpositively to free said interlock means so as to effect rotation of saidcam means.

2. The structure dened in claim 1, comprising a locking lever whichconstitutes said interlock means.

3. The structure defined in claim 2, comprising means effective at theend of one revolution of said cam means for restoring said trigger leverand said locking lever to cause said locking lever to stop the rotationof said cam means. f l

4. The structure defined in claim 1, comprising restoring means actuatedby said cam means at the end of one revolution thereof for restoringsaid armature to initial position.

5. The structure defined in claim 4, wherein a pivotally mounted leverconstitutes said restoring means, said cam means actuating said lastnamed lever at the end of one revolution thereof to cause it to restoresaid armature, and spring means for thereafter restoring such lever toits normal position.

6. In a start-stop teleprinter receiver having rotatable receiver cammeans and means attempting to rotate it and having a receiver magnetwhich is normally energized to hold a coacting armature normally inattracted position, a device for controlling the operation of said cammeans, said device being interposed between said armature and said cammeans and comprising a locking lever for normally locking said cam meansagainst rotation, a trigger lever for interlocking engagement with saidlocking lever, an operating arm projecting from said trigger lever, thefree end of said arm being spaced from said armature by a distancecorresponding to the major portion of the angular release travel thereofresponsive to deenergization of said magnet, whereby said armature movesupon release thereof through such major portion Wholly unimpeded by anyexternal force to strike said trigger lever with momentum stored by suchunimpeded motion for the purpose of positively actuating said triggerlever to release said locking lever so as to release said cam means forrotation.

7. The structure defined in claim 6, comprising spring means for biasingsaid armature in the direction of its release motion, and spring meansfor biasing said trigger lever in the direction of its normal positionrelative to said armature.

8. The structure defined in claim 6, comprising a restoring lever, andmeans controlled by said cam means upon conclusion of a revolutionthereof for actuating said restoring lever to operate said armature soas to restore it to its initial position.

9. The structure defined in claim 8, comprising spring means for biasingsaid armature in the direction of the release motion thereof, springmeans for biasing said trigger lever in the direction of its normalposition relative to said armature, and spring means for biasing saidrestoring lever in the direction of its normal position relative to saidarmature.

References Cited in the tile of this patent UNITED STATES PATENTS

